linux-kernel - Re: [PATCH] dlm: check the maximum size of a request from user

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Message-ID: <20120910154337.GA1474@redhat.com>
Date:	Mon, 10 Sep 2012 11:43:37 -0400
From:	David Teigland <teigland@...hat.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	ccaulfie@...hat.com, cluster-devel@...hat.com,
	linux-kernel@...r.kernel.org, davej@...hat.com
Subject: Re: [PATCH] dlm: check the maximum size of a request from user

On Sun, Sep 09, 2012 at 04:16:58PM +0200, Sasha Levin wrote:
> device_write only checks whether the request size is big enough, but it doesn't
> check if the size is too big.
> 
> At that point, it also tries to allocate as much memory as the user has requested
> even if it's too much. This can lead to OOM killer kicking in, or memory corruption
> if (count + 1) overflows.

thanks, pushed to next

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